If the User ID Verification function is enabled for adding a batch, the Change User button is available. You can temporarily change the user who will be performing the function. Any security checks (area privileges, and so on) are performed on the changed user.
Fixed aliases are already resolved to the unit shown and cannot have their equipment resolution changed.
If no units are available in the list, contact a supervisor. Possible causes: you may not have the correct privileges for the areas assigned to this Batch Executive; or, there are no units of the required unit class are assigned to this Batch Executive.